I've been building an open-source, self-hostable Firecracker orchestrator for the past month: https://github.com/sahil-shubham/bhatti (https://bhatti.sh)

Still WIP, but the core works — three rootfs tiers (minimal Ubuntu, headless Chromium with CDP, Docker-in-VM), OCI image support (pull any Docker image), automatic thermal management (idle VMs pause then snapshot to disk, wake transparently on next API call), per-user bridge networking with L2 isolation, named checkpoints, persistent volumes, and preview URLs with auto-wake.

Fair warning: the website is too technical and the docs are mostly AI-generated, both being actively reworked. But I've been running it daily on a Hetzner server for my AI agents' browser automation, and deploy previews.

I'd love any feedback if you want to go ahead and try it yourself